threadnetwork/aidl/default/socket_interface.cpp - android_hardware_interfaces - Gitiles

 /*
  * Copyright (C) 2024 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 /**
  * @file
  *   This file includes the implementation for the Socket interface to radio
  * (RCP).
  */

 #include "socket_interface.hpp"

 #include <errno.h>
 #include <linux/limits.h>
 #include <openthread/logging.h>
 #include <sys/inotify.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/un.h>
 #include <sys/wait.h>
 #include <unistd.h>

 #include <string>
 #include <vector>

 #include "common/code_utils.hpp"
 #include "openthread/error.h"
 #include "openthread/openthread-system.h"
 #include "platform-posix.h"

 namespace aidl {
 namespace android {
 namespace hardware {
 namespace threadnetwork {

 const char SocketInterface::kLogModuleName[] = "SocketIntface";

 SocketInterface::SocketInterface(const ot::Url::Url& aRadioUrl)
     : mReceiveFrameCallback(nullptr),
       mReceiveFrameContext(nullptr),
       mReceiveFrameBuffer(nullptr),
       mRadioUrl(aRadioUrl) {
     ResetStates();
 }

 otError SocketInterface::Init(ReceiveFrameCallback aCallback, void* aCallbackContext,
                               RxFrameBuffer& aFrameBuffer) {
     otError error = InitSocket();

     VerifyOrExit(error == OT_ERROR_NONE);

     mReceiveFrameCallback = aCallback;
     mReceiveFrameContext = aCallbackContext;
     mReceiveFrameBuffer = &aFrameBuffer;

 exit:
     return error;
 }

 SocketInterface::~SocketInterface(void) {
     Deinit();
 }

 void SocketInterface::Deinit(void) {
     CloseFile();

     mReceiveFrameCallback = nullptr;
     mReceiveFrameContext = nullptr;
     mReceiveFrameBuffer = nullptr;
 }

 otError SocketInterface::SendFrame(const uint8_t* aFrame, uint16_t aLength) {
     Write(aFrame, aLength);

     return OT_ERROR_NONE;
 }

 otError SocketInterface::WaitForFrame(uint64_t aTimeoutUs) {
     otError error = OT_ERROR_NONE;
     struct timeval timeout;
     timeout.tv_sec = static_cast<time_t>(aTimeoutUs / OT_US_PER_S);
     timeout.tv_usec = static_cast<suseconds_t>(aTimeoutUs % OT_US_PER_S);

     fd_set readFds;
     fd_set errorFds;
     int rval;

     FD_ZERO(&readFds);
     FD_ZERO(&errorFds);
     FD_SET(mSockFd, &readFds);
     FD_SET(mSockFd, &errorFds);

     rval = TEMP_FAILURE_RETRY(select(mSockFd + 1, &readFds, nullptr, &errorFds, &timeout));

     if (rval > 0) {
         if (FD_ISSET(mSockFd, &readFds)) {
             Read();
         } else if (FD_ISSET(mSockFd, &errorFds)) {
             DieNowWithMessage("RCP error", OT_EXIT_FAILURE);
         } else {
             DieNow(OT_EXIT_FAILURE);
         }
     } else if (rval == 0) {
         ExitNow(error = OT_ERROR_RESPONSE_TIMEOUT);
     } else {
         DieNowWithMessage("Wait response", OT_EXIT_FAILURE);
     }

 exit:
     return error;
 }

 otError SocketInterface::WaitForHardwareResetCompletion(uint32_t aTimeoutMs) {
     otError error = OT_ERROR_NONE;
     int retries = 0;
     int rval;

     while (mIsHardwareResetting && retries++ < kMaxRetriesForSocketCloseCheck) {
         struct timeval timeout;
         timeout.tv_sec = static_cast<time_t>(aTimeoutMs / OT_MS_PER_S);
         timeout.tv_usec = static_cast<suseconds_t>((aTimeoutMs % OT_MS_PER_S) * OT_MS_PER_S);

         fd_set readFds;

         FD_ZERO(&readFds);
         FD_SET(mSockFd, &readFds);

         rval = TEMP_FAILURE_RETRY(select(mSockFd + 1, &readFds, nullptr, nullptr, &timeout));

         if (rval > 0) {
             Read();
         } else if (rval < 0) {
             DieNowWithMessage("Wait response", OT_EXIT_ERROR_ERRNO);
         } else {
             LogInfo("Waiting for hardware reset, retry attempt: %d, max attempt: %d", retries,
                     kMaxRetriesForSocketCloseCheck);
         }
     }

     VerifyOrExit(!mIsHardwareResetting, error = OT_ERROR_FAILED);

 exit:
     return error;
 }

 otError SocketInterface::InitSocket() {
     otError error = OT_ERROR_NONE;
     int retries = 0;

     VerifyOrExit(mSockFd == -1, error = OT_ERROR_ALREADY);

     while (retries++ < kMaxRetriesForSocketInit) {
         WaitForSocketFileCreated(mRadioUrl.GetPath());
         mSockFd = OpenFile(mRadioUrl);
         VerifyOrExit(mSockFd == -1);
     }
     error = OT_ERROR_FAILED;

 exit:
     return error;
 }

 void SocketInterface::UpdateFdSet(void* aMainloopContext) {
     otSysMainloopContext* context = reinterpret_cast<otSysMainloopContext*>(aMainloopContext);

     assert(context != nullptr);

     VerifyOrExit(mSockFd != -1);

     FD_SET(mSockFd, &context->mReadFdSet);

     if (context->mMaxFd < mSockFd) {
         context->mMaxFd = mSockFd;
     }

 exit:
     return;
 }

 void SocketInterface::Process(const void* aMainloopContext) {
     const otSysMainloopContext* context =
             reinterpret_cast<const otSysMainloopContext*>(aMainloopContext);

     assert(context != nullptr);

     VerifyOrExit(mSockFd != -1);

     if (FD_ISSET(mSockFd, &context->mReadFdSet)) {
         Read();
     }

 exit:
     return;
 }

 otError SocketInterface::HardwareReset(void) {
     otError error = OT_ERROR_NONE;
     std::vector<uint8_t> resetCommand = {SPINEL_HEADER_FLAG, SPINEL_CMD_RESET, 0x04};

     mIsHardwareResetting = true;
     SendFrame(resetCommand.data(), resetCommand.size());

     return WaitForHardwareResetCompletion(kMaxSelectTimeMs);
 }

 void SocketInterface::Read(void) {
     uint8_t buffer[kMaxFrameSize];
     ssize_t rval;

     VerifyOrExit(mSockFd != -1);

     rval = TEMP_FAILURE_RETRY(read(mSockFd, buffer, sizeof(buffer)));

     if (rval > 0) {
         ProcessReceivedData(buffer, static_cast<uint16_t>(rval));
     } else if (rval < 0) {
         DieNow(OT_EXIT_ERROR_ERRNO);
     } else {
         LogWarn("Socket connection is closed by remote, isHardwareReset: %d", mIsHardwareResetting);
         ResetStates();
         InitSocket();
     }

 exit:
     return;
 }

 void SocketInterface::Write(const uint8_t* aFrame, uint16_t aLength) {
     ssize_t rval = TEMP_FAILURE_RETRY(write(mSockFd, aFrame, aLength));
     VerifyOrDie(rval >= 0, OT_EXIT_ERROR_ERRNO);
     VerifyOrDie(rval > 0, OT_EXIT_FAILURE);
 }

 void SocketInterface::ProcessReceivedData(const uint8_t* aBuffer, uint16_t aLength) {
     while (aLength--) {
         uint8_t byte = *aBuffer++;
         if (mReceiveFrameBuffer->CanWrite(sizeof(uint8_t))) {
             IgnoreError(mReceiveFrameBuffer->WriteByte(byte));
         } else {
             HandleSocketFrame(this, OT_ERROR_NO_BUFS);
             return;
         }
     }
     HandleSocketFrame(this, OT_ERROR_NONE);
 }

 void SocketInterface::HandleSocketFrame(void* aContext, otError aError) {
     static_cast<SocketInterface*>(aContext)->HandleSocketFrame(aError);
 }

 void SocketInterface::HandleSocketFrame(otError aError) {
     VerifyOrExit((mReceiveFrameCallback != nullptr) && (mReceiveFrameBuffer != nullptr));

     if (aError == OT_ERROR_NONE) {
         mReceiveFrameCallback(mReceiveFrameContext);
     } else {
         mReceiveFrameBuffer->DiscardFrame();
         LogWarn("Process socket frame failed: %s", otThreadErrorToString(aError));
     }

 exit:
     return;
 }

 int SocketInterface::OpenFile(const ot::Url::Url& aRadioUrl) {
     int fd = -1;
     sockaddr_un serverAddress;

     VerifyOrExit(sizeof(serverAddress.sun_path) > strlen(aRadioUrl.GetPath()),
                  LogCrit("Invalid file path length"));
     strncpy(serverAddress.sun_path, aRadioUrl.GetPath(), sizeof(serverAddress.sun_path));
     serverAddress.sun_family = AF_UNIX;

     fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
     VerifyOrExit(fd != -1, LogCrit("open(): errno=%s", strerror(errno)));

     if (connect(fd, reinterpret_cast<struct sockaddr*>(&serverAddress), sizeof(serverAddress)) ==
         -1) {
         LogCrit("connect(): errno=%s", strerror(errno));
         close(fd);
         fd = -1;
     }

 exit:
     return fd;
 }

 void SocketInterface::CloseFile(void) {
     VerifyOrExit(mSockFd != -1);

     VerifyOrExit(0 == close(mSockFd), LogCrit("close(): errno=%s", strerror(errno)));
     VerifyOrExit(wait(nullptr) != -1 || errno == ECHILD,
                  LogCrit("wait(): errno=%s", strerror(errno)));

     mSockFd = -1;

 exit:
     return;
 }

 void SocketInterface::WaitForSocketFileCreated(const char* aPath) {
     int inotifyFd;
     int wd;
     int lastSlashIdx;
     std::string folderPath;
     std::string socketPath(aPath);

     VerifyOrExit(!IsSocketFileExisted(aPath));

     inotifyFd = inotify_init();
     VerifyOrDie(inotifyFd != -1, OT_EXIT_ERROR_ERRNO);

     lastSlashIdx = socketPath.find_last_of('/');
     VerifyOrDie(lastSlashIdx != std::string::npos, OT_EXIT_ERROR_ERRNO);

     folderPath = socketPath.substr(0, lastSlashIdx);
     wd = inotify_add_watch(inotifyFd, folderPath.c_str(), IN_CREATE);
     VerifyOrDie(wd != -1, OT_EXIT_ERROR_ERRNO);

     LogInfo("Waiting for socket file %s be created...", aPath);

     while (true) {
         fd_set fds;
         FD_ZERO(&fds);
         FD_SET(inotifyFd, &fds);
         struct timeval timeout = {kMaxSelectTimeMs / OT_MS_PER_S,
                                   (kMaxSelectTimeMs % OT_MS_PER_S) * OT_MS_PER_S};

         int rval = select(inotifyFd + 1, &fds, nullptr, nullptr, &timeout);
         VerifyOrDie(rval >= 0, OT_EXIT_ERROR_ERRNO);

         if (rval == 0 && IsSocketFileExisted(aPath)) {
             break;
         }

         if (FD_ISSET(inotifyFd, &fds)) {
             char buffer[sizeof(struct inotify_event) + NAME_MAX + 1];
             ssize_t bytesRead = read(inotifyFd, buffer, sizeof(buffer));

             VerifyOrDie(bytesRead >= 0, OT_EXIT_ERROR_ERRNO);

             struct inotify_event* event = reinterpret_cast<struct inotify_event*>(buffer);
             if ((event->mask & IN_CREATE) && IsSocketFileExisted(aPath)) {
                 break;
             }
         }
     }

     close(inotifyFd);

 exit:
     LogInfo("Socket file: %s is created", aPath);
     return;
 }

 bool SocketInterface::IsSocketFileExisted(const char* aPath) {
     struct stat st;
     return stat(aPath, &st) == 0 && S_ISSOCK(st.st_mode);
 }

 void SocketInterface::ResetStates() {
     mSockFd = -1;
     mIsHardwareResetting = false;
     memset(&mInterfaceMetrics, 0, sizeof(mInterfaceMetrics));
     mInterfaceMetrics.mRcpInterfaceType = kSpinelInterfaceTypeVendor;
 }

 }  // namespace threadnetwork
 }  // namespace hardware
 }  // namespace android
 }  // namespace aidl
	/*
	* Copyright (C) 2024 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/**
	* @file
	* This file includes the implementation for the Socket interface to radio
	* (RCP).
	*/

	#include "socket_interface.hpp"

	#include <errno.h>
	#include <linux/limits.h>
	#include <openthread/logging.h>
	#include <sys/inotify.h>
	#include <sys/socket.h>
	#include <sys/stat.h>
	#include <sys/un.h>
	#include <sys/wait.h>
	#include <unistd.h>

	#include <string>
	#include <vector>

	#include "common/code_utils.hpp"
	#include "openthread/error.h"
	#include "openthread/openthread-system.h"
	#include "platform-posix.h"

	namespace aidl {
	namespace android {
	namespace hardware {
	namespace threadnetwork {

	const char SocketInterface::kLogModuleName[] = "SocketIntface";

	SocketInterface::SocketInterface(const ot::Url::Url& aRadioUrl)
	: mReceiveFrameCallback(nullptr),
	mReceiveFrameContext(nullptr),
	mReceiveFrameBuffer(nullptr),
	mRadioUrl(aRadioUrl) {
	ResetStates();
	}

	otError SocketInterface::Init(ReceiveFrameCallback aCallback, void* aCallbackContext,
	RxFrameBuffer& aFrameBuffer) {
	otError error = InitSocket();

	VerifyOrExit(error == OT_ERROR_NONE);

	mReceiveFrameCallback = aCallback;
	mReceiveFrameContext = aCallbackContext;
	mReceiveFrameBuffer = &aFrameBuffer;

	exit:
	return error;
	}

	SocketInterface::~SocketInterface(void) {
	Deinit();
	}

	void SocketInterface::Deinit(void) {
	CloseFile();

	mReceiveFrameCallback = nullptr;
	mReceiveFrameContext = nullptr;
	mReceiveFrameBuffer = nullptr;
	}

	otError SocketInterface::SendFrame(const uint8_t* aFrame, uint16_t aLength) {
	Write(aFrame, aLength);

	return OT_ERROR_NONE;
	}

	otError SocketInterface::WaitForFrame(uint64_t aTimeoutUs) {
	otError error = OT_ERROR_NONE;
	struct timeval timeout;
	timeout.tv_sec = static_cast<time_t>(aTimeoutUs / OT_US_PER_S);
	timeout.tv_usec = static_cast<suseconds_t>(aTimeoutUs % OT_US_PER_S);

	fd_set readFds;
	fd_set errorFds;
	int rval;

	FD_ZERO(&readFds);
	FD_ZERO(&errorFds);
	FD_SET(mSockFd, &readFds);
	FD_SET(mSockFd, &errorFds);

	rval = TEMP_FAILURE_RETRY(select(mSockFd + 1, &readFds, nullptr, &errorFds, &timeout));

	if (rval > 0) {
	if (FD_ISSET(mSockFd, &readFds)) {
	Read();
	} else if (FD_ISSET(mSockFd, &errorFds)) {
	DieNowWithMessage("RCP error", OT_EXIT_FAILURE);
	} else {
	DieNow(OT_EXIT_FAILURE);
	}
	} else if (rval == 0) {
	ExitNow(error = OT_ERROR_RESPONSE_TIMEOUT);
	} else {
	DieNowWithMessage("Wait response", OT_EXIT_FAILURE);
	}

	exit:
	return error;
	}

	otError SocketInterface::WaitForHardwareResetCompletion(uint32_t aTimeoutMs) {
	otError error = OT_ERROR_NONE;
	int retries = 0;
	int rval;

	while (mIsHardwareResetting && retries++ < kMaxRetriesForSocketCloseCheck) {
	struct timeval timeout;
	timeout.tv_sec = static_cast<time_t>(aTimeoutMs / OT_MS_PER_S);
	timeout.tv_usec = static_cast<suseconds_t>((aTimeoutMs % OT_MS_PER_S) * OT_MS_PER_S);

	fd_set readFds;

	FD_ZERO(&readFds);
	FD_SET(mSockFd, &readFds);

	rval = TEMP_FAILURE_RETRY(select(mSockFd + 1, &readFds, nullptr, nullptr, &timeout));

	if (rval > 0) {
	Read();
	} else if (rval < 0) {
	DieNowWithMessage("Wait response", OT_EXIT_ERROR_ERRNO);
	} else {
	LogInfo("Waiting for hardware reset, retry attempt: %d, max attempt: %d", retries,
	kMaxRetriesForSocketCloseCheck);
	}
	}

	VerifyOrExit(!mIsHardwareResetting, error = OT_ERROR_FAILED);

	exit:
	return error;
	}

	otError SocketInterface::InitSocket() {
	otError error = OT_ERROR_NONE;
	int retries = 0;

	VerifyOrExit(mSockFd == -1, error = OT_ERROR_ALREADY);

	while (retries++ < kMaxRetriesForSocketInit) {
	WaitForSocketFileCreated(mRadioUrl.GetPath());
	mSockFd = OpenFile(mRadioUrl);
	VerifyOrExit(mSockFd == -1);
	}
	error = OT_ERROR_FAILED;

	exit:
	return error;
	}

	void SocketInterface::UpdateFdSet(void* aMainloopContext) {
	otSysMainloopContext* context = reinterpret_cast<otSysMainloopContext*>(aMainloopContext);

	assert(context != nullptr);

	VerifyOrExit(mSockFd != -1);

	FD_SET(mSockFd, &context->mReadFdSet);

	if (context->mMaxFd < mSockFd) {
	context->mMaxFd = mSockFd;
	}

	exit:
	return;
	}

	void SocketInterface::Process(const void* aMainloopContext) {
	const otSysMainloopContext* context =
	reinterpret_cast<const otSysMainloopContext*>(aMainloopContext);

	assert(context != nullptr);

	VerifyOrExit(mSockFd != -1);

	if (FD_ISSET(mSockFd, &context->mReadFdSet)) {
	Read();
	}

	exit:
	return;
	}

	otError SocketInterface::HardwareReset(void) {
	otError error = OT_ERROR_NONE;
	std::vector<uint8_t> resetCommand = {SPINEL_HEADER_FLAG, SPINEL_CMD_RESET, 0x04};

	mIsHardwareResetting = true;
	SendFrame(resetCommand.data(), resetCommand.size());

	return WaitForHardwareResetCompletion(kMaxSelectTimeMs);
	}

	void SocketInterface::Read(void) {
	uint8_t buffer[kMaxFrameSize];
	ssize_t rval;

	VerifyOrExit(mSockFd != -1);

	rval = TEMP_FAILURE_RETRY(read(mSockFd, buffer, sizeof(buffer)));

	if (rval > 0) {
	ProcessReceivedData(buffer, static_cast<uint16_t>(rval));
	} else if (rval < 0) {
	DieNow(OT_EXIT_ERROR_ERRNO);
	} else {
	LogWarn("Socket connection is closed by remote, isHardwareReset: %d", mIsHardwareResetting);
	ResetStates();
	InitSocket();
	}

	exit:
	return;
	}

	void SocketInterface::Write(const uint8_t* aFrame, uint16_t aLength) {
	ssize_t rval = TEMP_FAILURE_RETRY(write(mSockFd, aFrame, aLength));
	VerifyOrDie(rval >= 0, OT_EXIT_ERROR_ERRNO);
	VerifyOrDie(rval > 0, OT_EXIT_FAILURE);
	}

	void SocketInterface::ProcessReceivedData(const uint8_t* aBuffer, uint16_t aLength) {
	while (aLength--) {
	uint8_t byte = *aBuffer++;
	if (mReceiveFrameBuffer->CanWrite(sizeof(uint8_t))) {
	IgnoreError(mReceiveFrameBuffer->WriteByte(byte));
	} else {
	HandleSocketFrame(this, OT_ERROR_NO_BUFS);
	return;
	}
	}
	HandleSocketFrame(this, OT_ERROR_NONE);
	}

	void SocketInterface::HandleSocketFrame(void* aContext, otError aError) {
	static_cast<SocketInterface*>(aContext)->HandleSocketFrame(aError);
	}

	void SocketInterface::HandleSocketFrame(otError aError) {
	VerifyOrExit((mReceiveFrameCallback != nullptr) && (mReceiveFrameBuffer != nullptr));

	if (aError == OT_ERROR_NONE) {
	mReceiveFrameCallback(mReceiveFrameContext);
	} else {
	mReceiveFrameBuffer->DiscardFrame();
	LogWarn("Process socket frame failed: %s", otThreadErrorToString(aError));
	}

	exit:
	return;
	}

	int SocketInterface::OpenFile(const ot::Url::Url& aRadioUrl) {
	int fd = -1;
	sockaddr_un serverAddress;

	VerifyOrExit(sizeof(serverAddress.sun_path) > strlen(aRadioUrl.GetPath()),
	LogCrit("Invalid file path length"));
	strncpy(serverAddress.sun_path, aRadioUrl.GetPath(), sizeof(serverAddress.sun_path));
	serverAddress.sun_family = AF_UNIX;

	fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
	VerifyOrExit(fd != -1, LogCrit("open(): errno=%s", strerror(errno)));

	if (connect(fd, reinterpret_cast<struct sockaddr*>(&serverAddress), sizeof(serverAddress)) ==
	-1) {
	LogCrit("connect(): errno=%s", strerror(errno));
	close(fd);
	fd = -1;
	}

	exit:
	return fd;
	}

	void SocketInterface::CloseFile(void) {
	VerifyOrExit(mSockFd != -1);

	VerifyOrExit(0 == close(mSockFd), LogCrit("close(): errno=%s", strerror(errno)));
	VerifyOrExit(wait(nullptr) != -1 \|\| errno == ECHILD,
	LogCrit("wait(): errno=%s", strerror(errno)));

	mSockFd = -1;

	exit:
	return;
	}

	void SocketInterface::WaitForSocketFileCreated(const char* aPath) {
	int inotifyFd;
	int wd;
	int lastSlashIdx;
	std::string folderPath;
	std::string socketPath(aPath);

	VerifyOrExit(!IsSocketFileExisted(aPath));

	inotifyFd = inotify_init();
	VerifyOrDie(inotifyFd != -1, OT_EXIT_ERROR_ERRNO);

	lastSlashIdx = socketPath.find_last_of('/');
	VerifyOrDie(lastSlashIdx != std::string::npos, OT_EXIT_ERROR_ERRNO);

	folderPath = socketPath.substr(0, lastSlashIdx);
	wd = inotify_add_watch(inotifyFd, folderPath.c_str(), IN_CREATE);
	VerifyOrDie(wd != -1, OT_EXIT_ERROR_ERRNO);

	LogInfo("Waiting for socket file %s be created...", aPath);

	while (true) {
	fd_set fds;
	FD_ZERO(&fds);
	FD_SET(inotifyFd, &fds);
	struct timeval timeout = {kMaxSelectTimeMs / OT_MS_PER_S,
	(kMaxSelectTimeMs % OT_MS_PER_S) * OT_MS_PER_S};

	int rval = select(inotifyFd + 1, &fds, nullptr, nullptr, &timeout);
	VerifyOrDie(rval >= 0, OT_EXIT_ERROR_ERRNO);

	if (rval == 0 && IsSocketFileExisted(aPath)) {
	break;
	}

	if (FD_ISSET(inotifyFd, &fds)) {
	char buffer[sizeof(struct inotify_event) + NAME_MAX + 1];
	ssize_t bytesRead = read(inotifyFd, buffer, sizeof(buffer));

	VerifyOrDie(bytesRead >= 0, OT_EXIT_ERROR_ERRNO);

	struct inotify_event* event = reinterpret_cast<struct inotify_event*>(buffer);
	if ((event->mask & IN_CREATE) && IsSocketFileExisted(aPath)) {
	break;
	}
	}
	}

	close(inotifyFd);

	exit:
	LogInfo("Socket file: %s is created", aPath);
	return;
	}

	bool SocketInterface::IsSocketFileExisted(const char* aPath) {
	struct stat st;
	return stat(aPath, &st) == 0 && S_ISSOCK(st.st_mode);
	}

	void SocketInterface::ResetStates() {
	mSockFd = -1;
	mIsHardwareResetting = false;
	memset(&mInterfaceMetrics, 0, sizeof(mInterfaceMetrics));
	mInterfaceMetrics.mRcpInterfaceType = kSpinelInterfaceTypeVendor;
	}

	} // namespace threadnetwork
	} // namespace hardware
	} // namespace android
	} // namespace aidl